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<Head>
<Title>find_if</Title>
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<H1>find_if</H1>
<Table CellPadding=0 CellSpacing=0 width=100%>
<TR>
<TD Align=left><Img src = "algorithms.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
<TD Align=right><Img src = "function.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
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<TR>
<TD Align=left VAlign=top><b>Category</b>: algorithms</TD>
<TD Align=right VAlign=top><b>Component type</b>: function</TD>
</TR>
</Table>
<h3>Prototype</h3>
<pre>
template<class <A href="InputIterator.html">InputIterator</A>, class <A href="Predicate.html">Predicate</A>>
InputIterator find_if(InputIterator first, InputIterator last,
Predicate pred);
</pre>
<h3>Description</h3>
Returns the first iterator <tt>i</tt> in the range <tt>[first, last)</tt> such that
<tt>pred(*i)</tt> is true. Returns <tt>last</tt> if no such iterator exists.
<h3>Definition</h3>
Defined in the standard header <A href="algorithm">algorithm</A>, and in the nonstandard
backward-compatibility header <A href="algo.h">algo.h</A>.
<h3>Requirements on types</h3>
<UL>
<LI>
Predicate is a model of <A href="Predicate.html">Predicate</A>.
<LI>
InputIterator is a model of <A href="InputIterator.html">InputIterator</A>.
<LI>
The value type of InputIterator is convertible to the argument type
of Predicate.
</UL>
<h3>Preconditions</h3>
<UL>
<LI>
<tt>[first, last)</tt> is a valid range.
<LI>
For each iterator <tt>i</tt> in the range <tt>[first, last)</tt>, *i is in the
domain of Predicate.
</UL>
<h3>Complexity</h3>
Linear: at most <tt>last - first</tt> applications of <tt>Pred</tt>.
<h3>Example</h3>
<pre>
<A href="List.html">list</A><int> L;
L.push_back(-3);
L.push_back(0);
L.push_back(3);
L.push_back(-2);
<A href="List.html">list</A><int>::iterator result = find_if(L.begin(), L.end(),
bind2nd(greater<int>(), 0));
assert(result == L.end() || *result > 0);
</pre>
<h3>Notes</h3>
<h3>See also</h3>
<A href="find.html">find</A>.
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